Originally Posted by tom yfz

Jonro, Hate to tell you this, but the tune was off on that engine.
The piston has been cooked, and detination from being lean,and more than likely the lean condition has hammered the rod bushing out and changed the compression and timing, which in turn burnt the glow plug out.
I would not salvage anything out of that engine other than the carb and head!
Adam Drakes tune on this engine is:
.045 in from flush Hsn
.045 out from flush Lsn
.030 in from flush, idle screw
6mm restrictor
GRP 5 plug ( I run a GRP 4 plug)
2035 GRP pipe
The engine will run between 150 to 190 degrees(nitrotane,30%)
Good Luck